There is a reason we appear to be physicaly unable to experiment that kind of happiness this thread is talking about. The only question is what we'll choose once we are able to change our own brains to make it possible, but then, that's a completely unkown context, so we'll probably choose some option that we can't even imagine today.
But the answer we give now to the question of what will we do tells us something about us, regardless of whether we're actually right or not. Which, in addition, is what good science fiction does; paraphrasing Ursula Le Guin, it invents lies to tell the truth about who we are, right now.
There is a reason we appear to be physicaly unable to experiment that kind of happiness this thread is talking about. The only question is what we'll choose once we are able to change our own brains to make it possible, but then, that's a completely unkown context, so we'll probably choose some option that we can't even imagine today.